Contribution à l'étude du mode SQS : développement d'un prototype de chambre à localisation : mécanisme de propagation
du streamer by Jean-Jacques Florent(
Book
)1
edition published
in
1989
in
French
and held by
3 WorldCat member
libraries
worldwide
This work is a study of the Self-Quenching Streamer mode in gaseous detectors.The set-up of a prototype devoted to the localization
of light particles in the focal plane of a spectrometer and the experimental results are presented in the first part. The
prototype is a cathode read-out multiwire chamber with an Argon-Ethane mixture. The cathode charge distribution is studied.
We confirm that the SQS mode is not saturated, but for an adequate choice of the high voltage, we find that the dynamics of
the pulses is sufficiently limited to allow 100% efficiency with Z = 1 or 2 particles. The intrinsic spatial resolution is
about 200 micrometers. We evaluate the factors contributing to the differential linearity. In the second part, we discuss
the streamer propagation mechanisms. Several numeric computation programs were written for this purpose, the most important
being:- A Monte-Carlo program simulates the evolution of an electron population in a constant field or during an avalanche
taking into account the collisions inside the plasma.- A program is based on a phenomenological model describing the space
charge field which governs the streamer propagation starting with experimental or calculated parameters. The first allows
the interpretation of the very large dependence of drift velocities on the composition of the gas mixture, and an estimation
of the production rates of UV photons in the primary avalanche. With the second we propose a criterion for the transition
to SQS mode. A dynamical description of the behavior of the streamer during the first twenty nanoseconds explains some of
the experimental observations. A microscopie mode for the streamer propagation is proposed

It's a stretch : is connective tissue the link to yoga's benefits?(
Visual
)1
edition published
in
2011
in
English
and held by
2 WorldCat member
libraries
worldwide
Dr. Langevin discusses the benefits of active stretching, specifically yoga. She examines how activities like yoga effect
connective tissue at the cellular level during stretching

Radiation and modern life : fulfilling Marie Curie's dream by Alan E Waltar(
Book
)1
edition published
in
2004
in
English
and held by
2 WorldCat member
libraries
worldwide
"In this overview of radiation's many great benefits and as yet untapped potential, Dr. Alan E. Waltar, past president of
the American Nuclear Society, explains how this important energy source has been harnessed to serve a plethora of humanitarian
functions. Through the use of anecdotes, Waltar provides numerous examples of radiation's many uses in agriculture, medicine,
electricity generation, modern industry, transportation, public safety, environmental protection, space exploration, and even
archeology and the arts. Estimating the total financial contribution of all these varied uses, Waltar comes to the revelation
that radiation technology now contributes more than $420 billion to the US economy and provides over 4.4 million jobs. In
the future, Dr. Waltar foresees continuous improvement in many areas of science, industry, and medicine through tapping the
incredible potential of Marie Curie's initial insights."--Jacket